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Optical zero? |
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kruzaroad 
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Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2524 |
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 Topic: Optical zero?Posted: 12 hours 35 minutes ago at 12:25pm |
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So I've been aware for a while of the technique of tin foil over scope lens with a small hole, set zoom lowest,ao lowest,get target as close as possible within foucus and fire a shot then measure from bulls to shot for scope height.
Supposed to give more accurate measurements in chair gun. So finally going to try it. The one thing i cant find on any video is wether I need to be set to optical zero, or if i can do it sighted in. Can anyone help me on this please. Cheers |
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RangerPete
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Joined: 19 Apr 2023 Location: Cambridge. Status: Offline Posts: 1011 |
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Posted: 9 hours 9 minutes ago at 3:51pm |
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Hi Kruza, what is it that you are trying to work out, the scope height?
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Walk quietly, but carry a big stick.
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kruzaroad
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Joined: 03 Jul 2022 Location: Hastings 4 now Status: Offline Posts: 2524 |
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Posted: 8 hours 45 minutes ago at 4:15pm |
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Hi Pete.
Yep but Im trying this way to see if it's more accurate than the half scope height and center of bore. |
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Billbobnz
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Joined: 14 Jun 2020 Location: Ashburton Status: Offline Posts: 914 |
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Posted: 5 hours 12 minutes ago at 7:48pm |
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This may be helpful
https://airgunforums.co.uk/threads/chairgun-tutorial.26534/ I will try and find that video of the tinfoil method |
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Billbobnz
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Joined: 14 Jun 2020 Location: Ashburton Status: Offline Posts: 914 |
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Posted: 5 hours 7 minutes ago at 7:53pm |
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This is in the above which I thought was interesting.
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nunga
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Joined: 09 Mar 2013 Location: Pukekohe Status: Offline Posts: 1068 |
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Posted: 2 hours 22 minutes ago at 10:38pm |
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Not sure how that method will give a more accurate measurement because you are limited to a number of factors. first off you have to make sure cross hairs in the scope are bang on center and that is floored because the cross hairs move up and down inside the scope which will give you a false height unless you are sure that is also dead center. Then you have to work out the center of the pellet hole in the paper target you have just shot. Too many things can go wrong. I have always done it the following way. Outside diameter of the barrel % by 2 (if the scope is long enough) or measure the outside diameter of the breach and divide that by two. and then the outside diameter of the scope and % by 2. Add the gap between the scope and the barrel plus the two other numbers and you cant go wrong. i use my Mitutoyo vernier calipers for this. To me this is a better method because the scope is fixed to the gun and that will not change
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